●An operating system is (74) .(74) A． the highest layer of softwareB． the lowest layer of softwareC． the highest layer of hardwareD． the lowest layer of hardware
●An operating system is (74) .
(74) A． the highest layer of software
B． the lowest layer of software
C． the highest layer of hardware
D． the lowest layer of hardware
相关考题：
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Acknowldgement, Sequencing, and Flow control are characteristics of which OSI layer?() A. Layer 2B. Layer 3C. Layer 4D. Layer 5E. Layer 6F. Layer 7
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Acknowledgements, sequencing, and flow control are characteristics of which OSI layer()。 A.Layer2B.Layer3C.Layer4D.Layer5E.Layer6F.Layer7